I have a SB 50 from my film camera days and finally tried it over the holidays on my D200. I had camera set for aperture priority and flash for manual mode; it really produced some great results. I bounced the flash off the ceiling and followed the guide number equation to set the exposure. Old stuff still works and fine for the occasional times I need a flash.
#1. "RE: Surprising Results: SB-50DX on a D200" In response to Reply # 0
Richmond Hill, GA (Savannah), US
Yes, as long as you don't need TTL, all the old Nikon speedlights sync and work perfectly on a modern DSLR.
However, if you want the flash to be primary, use your camera in Manual mode and set it to underexpose the ambient by 2 to 3 stops. If you use camera A mode, you will allow a lot of ambient into your image, which is fine as long as the ambient matches the flash color. If it doesn't match, you could have ugly results.